What is the Difference Between PROM and EPROM?

The main differences between Programmable Read-Only Memory (PROM) and Erasable Programmable Read-Only Memory (EPROM) are:

1. Reusability: PROM is not reusable, while EPROM is reusable multiple times.
2. Cost: PROM is generally inexpensive, while EPROM is costlier than PROM.
3. Writing and Erasing: Writing to PROM is irreversible, while EPROM can be erased and reprogrammed.
4. Storage Permanence: EPROM provides reduced storage permanence compared to PROM.
5. Transistors: PROM uses bipolar transistors, while EPROM uses MOS transistors in its construction.
6. Programming Medium: PROM is programmed electrically by the user, while EPROM is programmed optically.
7. Error Handling: If there's a miscalculation or error while writing on PROM, it becomes unusable. In contrast, if there's a miscalculation or error while writing on EPROM, it can still be used again.
8. Generations: PROM is the older version of EPROM, and EPROM is the modern version of PROM.
9. Scalability and Flexibility: PROM has more scalability and flexibility compared to EPROM.

In summary, PROM is a less expensive, single-use memory chip, while EPROM is a more expensive, reusable memory chip with reduced storage permanence. PROM uses bipolar transistors and is programmed electrically, while EPROM uses MOS transistors and is programmed optically.

Comparative Table: PROM vs EPROM

Here is a table comparing the differences between PROM and EPROM:

In summary, PROM is an older, less flexible technology that allows for one-time programming, while EPROM is a more modern and flexible technology that enables erasing and reprogramming multiple times using ultraviolet light.